Volume Mixer Is an App-Specific Volume Controller for Mac
Mac: Not all apps have the same base volume, and sometimes one app likes to yell at you while the other is too quiet. Volume Mixer allows you to independently adjust the volume of applications.
Volume Mixer is in the menu bar and you can easily move the volume up and down for each running application. It’s a simple little thing, but given that Windows users have always had it , it’s nice to have a way to do it on a Mac. The $ 10 asking price might be a little overpriced for some, but you can take advantage of the free 15-day trial to see if it suits your workflow.
Volume Faucet ($ 9.99) | via Product Hunt